Driver for studs and the like



Jan. 13, 1948- E, R. EMMoNs DRIVER FOR STUDS AND THE LIKE Filed Aug. 14, 1944 INVENTO l gzfgeneR.Emmons .f'ys.

Patented Jan. 13, 1948 DRIVER FOR STUDS AND THE LIKE Eugene R. Emmons, Goshen, vInd., assignor to Benn Electric Switch Co., Goshen, Ind., a corporation of Iowa Application August 14, 1944, Serial No. 549,315

4 Claims.

My invention relates to a driver for studs and the like so designed and constructed that the driver can be rota-ted for driving a stud into a threaded hole.

One object of the invention is to provide a driver that can be used on a pneumatic or electric motor and which is operable in a very simple manner by merely pushing a stud into the jaws of the driver, then using the driver to thread the stud into a threaded opening in a boss, housing or the like, and then after the stud is set, releasing the driver from the stud by the simple operation of pulling the driver away from the stud.

Another object is to provide a driver that has an automatically operable jaw arrangement for holding the stud, the jaws being formed of a plurality of parts which are openable and closable by axial movement in the body of the driver, axial movement in one direction being imparted to the jaws by engaging the thread of the stud with one of the jaw parts, and axial movement in the other direction being accomplished by withdrawing the body relative to the stud after the stud has been set.

A further object is to provide detent means for holding the jaws in either their opened or closed position, the driver having a disc-like knob surrounding it which can be engaged by hand for manual rotation of the driver if desired.

With these and other objects in View, my invention consists in the construction, arrangement and combination of the various parts of my device whereby the objects contemplated are attained, as hereinafter more iully set forth, pointed out in my claims and illustrated in the accompanying drawings, wherein:

Figure l is a perspective view of a stud driver embodying my invention and showing the jaws thereof spread apart.

Figure 2 is a longitudinal sectional view through the driver and showing how a stud is engaged with a jaw of the driver.

Figure 3 is a similar sectional view showing the stud pushed into the driver and the jaws thereby closed.

Figure 4 is a sectional view similar to Figure 3 and on the line 4 4 of Figure 3 showing the jaws in closed position, and

Figure 5 is a sectional view similar to Figure 4 showing the jaws in open position.

On the accompanying drawings, I have used the reference character B to indicate a body which has a shank lil extending into a motor M for operating my stud driver, the motor M may be of either pneumatic or electric type and may include an impact clutch arrangement which however forms no part of my present invention.

The body B has a bore I2 having tapered parts I4 and i6. The body B also has a pair of slots I8 opposite each other and a set screw seat 2U spaced from the slots i8. Within the body B is located a pair of jaws J. Each jaw has an annular groove 22 to receive a rubber or coiled spring ring 24, and the jaws are cross grooved as at 25. The grooves 26 together form a round hole and a pin 2l extends therethrough and has its ends located in the slots TB.

Over each slot i8, a ball 28' is located, the balls being in a bore 3d of a disc-like knob K. The balls 28 are spring pressed into the slots I8 by means of springs 32, held in position by threaded plugs 34. The knob K is rigidly held imposition on the body B by means of a set screw 36 seated in the seat 2G.

The jaws J are provided with enlarged heads 38 which are adapted to coact with the taper l5 of the bore l2, as will hereinafter appear. The jaws have threaded seats dii therein which when the jaws are closed constitute a threaded hole to receive a stud S and when the jaws are open they free the stud as shown in Figures 3 and 2 respectively. A smaller hole 42 is located at the In the operation of my stud driver, assuming the parts to be in the position shown in Figures l and 2 and the stud driver mounted on the shaft of the motor M, the stud S may be associated with the driver by placing it in the position shown in Figure 2 and then pushing the stud into the body B as indicated by the arrow a. The threads at the left hand end ofthe stud engage the threads of one of the jaws J so as to propel it and, through the pin 21, the other jaw into the body B to the position of Figure 3 when the stud is pushed inwardly. Accordingly the jaws close on the stud and it is obvious that when the position of Figure 3 is reached, the motor M may be manipulated so that the stud S engages the outer end of a threaded opening of a boss 44 or the like. When electrical energy or uid pressure is supplied to the motor M the stud will be rotated into the jaws as far as it will go and then the stud will be driven into the threaded opening of the boss.

After the stud is set, the motor M may be stopped, declutched or may be left running and the driver disassociated from the stud merely by withdrawing it therefrom. The withdrawing operation results in the jaws being pulled from the position in Figure 3 part way to the position of Figure 2 so that the jaws may disengage from the stud. During the withdrawal operation of the stud driver, the pin 21 snaps past the balls 28 and the balls nish the jaw opening movement. The balls serve to hold the jaws in either the position of Figure 3 or the position of Figure 4 when once they have been moved to either position. They thus keep the jaws closed on the stud while positioning it for entrance into a threaded opening and cooperate with the ring 24 to hold the jaws open after the stud is set and until the next stud is positioned in the driver.

Some changes may be madel in the construction and arrangement in the parts of my stud driver within the scope of the appended claims without departing from the real spirit and purpose of my invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. A driving chuck for studs and the like comprising a body adapted to be rotated, said body having a bore, a plurality of jaws axially movable in said bore, a, pin through said jaws and connecting them together, said pin pivotally mounting said jaws intermediate their ends, said body having longitudinal slots for the ends of said pin, spring pressed balls coacting with said pin to normal'y bias it to one or the other limits of its movement in said slots, said jaws having enlarged parts engaging with a portion of said bore to contract the jaws when they are pushed into said bore, said jaws having an interior thread to be engaged by a driver stud or the like whereby said stud may be used to position said stud in the jaws, said driver being removable from said stud after the same has been set, by withdrawal of said body relative to the stud, the stud thereby effecting an outward movement of said jaws to open the same, a resilient ring aro-und the inner ends of said jaws to open them, and a disc-like knob surrounding said body and having said spring pressed balls located therein.

2. A driving chuck for studs and the like cornprising a body adapted to be rotated, said body having a bore, a plurality o-f jaws axially movable in said bore, a pin through said jaws and connecting them together, said pin pivotally mounting said jaws intermediate their ends, saidy jaws, said driver being removable from said stud after the same has been set, by withdrawal of said body relative to the stud, the stud thereby effecting an outward movement of said jaws to open the same, and a resilient ring around the inner ends of said jaws to open them.

3. A driving chuck for studs and the like comprising a body adapted to be rotated, said body having a. bore, a plurality of jaws axially movable in said bore, a pin through said jaws and pivotally connecting them together, said body having longitudinal slots for the ends of said pin, spring pressed balls coacting with said pin to normally bias it to one or the other limits of its movement in said slots, said jaws having enlarged parts engaging with a portion of said bore to contract the jaws when they are pushed into said bore, said jaws having an interior thread to be engaged by a stud or the like whereby said stud may be used to position said stud in the jaws.

4. In a driver for studs, a body adapted to be rotated, said body having a bore, a plurality of jaws axially movable in said bore and having interior threads at their outer ends to be engaged by a stud, said jaws having opposed grooves in their adjacent faces substantially midway between said threads and the inner ends of the jaws, a pin received in said grooves whereby said jaws are pivotally movable relative to each other, said body having slots for the ends 0f said pin, said jaws having enlargements engaging with said bore to pivot said jaws on said pins relative to each other and thereby contract them when they are moved axially inward in relation to said bore thereby gripping a stud between the threaded portions of said jaws, said driver being removable from the stud after the same has been set by withdrawing the driver in relation to the stud, the stud thereby electing an outward movement of said jaws in said bore to permit the jaws to open, a resilient ring around the inner ends of said jaws to effect such opening by pivoting the jaws on said pin, and resilient detent means tending to keep said pin at either end of said slots of said body.

EUGENE R. EMMONS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,807,265 Walker May 26, 1931 2,086,167 Lamb July 6, 1937 573,487 Schaller Dec. 22, 1896 1,243,860 Olson et al Oct. 23, 1917 1,499,701 Skeel July l, 1924 1,607,804 Snyder Nov. 23, 1926 

